so, as i said, are changing operational environment demands new approaches. urban terrain will continue to be the predominant war fighting internment, bringing with a unique set of challenges. those challenges to my belief, deal with what i call precision. you know, and the days of desert , mountain, or jumbo warfare you could be less precise kaj especially in terms of, you know, the application of military power. in the day and age there are red warfare -- and we definitely see this coming even in the last decade as we work, you know, operate in places like flu shell or missile will or baghdad or kandahar, jalal about, these were urban areas, generally urban areas. as we see more and more of the population moving to end of organization affect, precision of our capability is going to be key, and the other way that i would describe it is understanding, you know, understanding should be a principle of war, as i'm concerned like economy of force or mastermind stand in the operational environment, one of the principal lessons learned from the last decade of war t